INVESTIGATION OF FLOW CONDITIONS AND STRUCTURAL DISPLACEMENT AROUND CAGE SYSTEM IN OVERFLOW LEVEE BASED ON MODEL EXPERIMENTS

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  • 模型実験に基づく堤防越流時におけるかご系構造物周りの流況と構造物変位の検討

Abstract

<p> In this study, the behavior of flow around cage system structure, cage deformation and filling stone in the levee overflow was examined experimentally in order to grasp the fundamental performance for the overflow in the case of placing cage system structure in the back slope and the back slope of levee. To begin with, this paper verifies the flow in and out of the cage layer by carrying out the experiment in which cage thickness and particle size of the filling stone were changed and overflow water depth was changed using a large horizontal open channel. Next, the deformation of the cage before and after the overflow and the movement of the cage were measured by 3D scanners. As the result, it became clear that the flow rate became constant from the depth of 4 division of the cage thickness in all cases, and that the flow rate was reduced for the flow rate of the cage surface, regardless of overflow water depth. In addition, this paper confirms that it has sufficient erosion resistance, because the deformation of a cage and drastic movement of a clogged stone are not recognized in the front and rear of overflow.</p>

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